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[Author] Seongheon JEONG(1hit)

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  • A 0.5–6 MHz Active-RC LPF with Fine Gain Steps Using Binary Interpolated Resistor Banks

    Sungho BECK  Seongheon JEONG  Sunki MIN  Myung-Woon HWANG  Stephen T. KIM  Kyutae LIM  Emmanouil M. TENTZERIS  

     
    BRIEF PAPER-Electronic Circuits

      Vol:
    E94-C No:8
      Page(s):
    1328-1331

    This paper proposes an active-RC filter that achieves a wide pseudo-continuous bandwidth-tuning range and a wide gain range with fine steps using a novel switched resistor architecture. A channel-selection filter with the proposed resistor bank is designed for a multi-mode mobile-TV receiver with the 6th order Chebyshev-I topology. The bandwidth, 0.5–6 MHz with 5% steps, supports multiple mobile-TV standards with sufficient margins for process and temperature variations. The filter also accomplishes a 30-dB variable gain range with 6-dB steps, and it relaxes the dynamic range requirement of a succeeding programmable gain amplifier. The power consumption of the filter, 3.4–5.0 mW, is adjustable according to the bandwidth and the signal level. The filter was fabricated with on-chip bandwidth-calibration circuitry in 0.18-µm CMOS and occupied 0.81 mm2.